Improvement in machines for grinding paper-pulp



UNITED STATES? PATENT OFFICE.

JOHN F.' JONES, `or ROCHESTER, Nnw Youn.`

.IMPR'OV'E'ME'NT IN MACHINES FOR. GRINDING PAPER-PULP.

Specification forming fart ot' I.etters Patent No. 47,421?, dated A-pril 25,' 1855.

To all whom it may concern,.- Be it .known that I, JOHN F. JoNEs, of

Rochester, in the county of Monroe and State of New York, have invented a certain new and useful Improvementin Machines for GrindlingfPaper-Pulp; Vand I do hereby declare that the following is a full and exact description thereof, reference being had to the-accom' -panyingdrawin'gs,making part of this Speciication. p V

Figure 1 isa perspective view of my-ilnproved machine Fig. 2, a central vertical sec- `tio i. Y Y Like letters of reference indicate corresl ondto retain the water better as iti-passes through,

and thus keep the pulp from clogging, which effect would not. be accomplished were the grinding-surfaces horizontal5jalso, in connection therewith, in theuse, of an inclosingcase having an i ncliued` bottom that catches 4 4 the grinding-surfaces made horizontal, the

the reduced pulp and conductsitaway."

l As represented in thc. drawings, Ais a suitable frame, in which is mounted a bed-disk, Il, which is stationary. Above this is situated aV revolving disk, C, having a central .l eye, F, into which the cut material for formingthe pulp is fed from aspout, D, above.

The revolving dis-k is secured, by arrnsa. a,

', or other convenient means, rigidly to a spindle,

E, which is driven -by a pulley, b, or equivalent, at the top, and passes 'loosely down through the bed-disk B and a suitable stuif- 'ing-box beneath it, its lower end resting-ina step, e, that is adjusted .higher or lower, to sepa-rate* the grinding-disks ,more 'o r less, by l means of a .hand screw, Gr.JIhe contiguousgrinding-surfaces d d of thedsks are formed'4 into teeth, or' are roughened inany desirable way; but instead of making these surfaces in horizontal planes, as is common in grind-ingmills for other purposes, I make them of dishin g form, or inclined upward from the center to the periphery, as clearly indicated in lig.l

2. Around the grinding-disksA is situated an inelosing-case, II, which receives the pulp after it has beenground and discharges it. through an reduction-spout, I, on one side.A

For the'purpose of allowing the pulp to tlow oii easily, I prefer to make ,the bottom. of the case somewhat inclined, `the sideon which the discharge spout I is situated'being alittle the lowest. The 'cut material, or i half-stuit, heing fed in from the spout D, through the hollow eye F, 'passes between the dishing grind'- ing-surtaces d [d with a proper amount ot' water to make it ow, and`when ground falls into the'ca'se H and escapes. By giving the grinding-surfaces the dishing form, instead t t forming them Vin horizontal planes, I accom--V plish an important result, for I' neutralize to a certaindegree the centrifugal action of the upper disk, `therebypreventing the'too rapid 'escape ot' the water. In other' words, 4the water and pulp have to rise upward to escape. against their own gravity, ln this'mannr I overcolne'the difficulty that would be experi` enced it the grinding-surfaceszweie in horizontal planes, for I dispense with an excessiveamount'ot' water to'kecp the pulp wet, and at. the same time, by using enough, prevent any clogging or choking of the. material. Were charge of the ground pulp, so as to prevent. l the same rising around the disks and interl ffl-.ringr with their action;

What I claim as my invention, and 4desire to secure by Letters Patent, is.y

The machine for grinding paper-pulp,- havi ing the grinding-surtaces d'd made dishing or I inclined Iupward from the center to the pcriplr" ery, and used in connection with thecase H,

the whole arranged `and operatin'g'subs'tantially as and 'for the purpose herein' set forth. In'witness whereof I have hereunto lsigned my name in the presence of two subscribing witnesses.

JOHN F.VJONES. Witnesses: t A

1t. F. -0sGooD, VJAY HYATT. 

